Mailman 3 October 2015 - yt-users

Porting .ply files to Blender with colors?
by Jill P. Naiman 15 Aug '22

15 Aug '22

Hi All, I was curious if anyone has had any luck porting .ply files generated with yt into Blender with colors? It seems to port in the surfaces just fine, but they are a uniform color. From what I can gather, Blender imports .ply files with face color instead of vertex so I tried the surf.export_ply routine with "face" instead of "vertex" for sample_type, but no luck ("vertex" doesn't work either). Let me know if I can provide any more useful info. Thanks for any help, -J

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Stars on volume rendering
by Elizabeth Harper-Clark 11 Dec '21

11 Dec '21

Hi all, Thanks for all your help over the last couple of days. One more question: - Can I plot particles on a volume rendered image? I have stars and I want to show where they are! Thanks, Libby -- Elizabeth Harper-Clark MA MSci PhD Candidate, Canadian Institute for Theoretical Astrophysics, UofT Sciences and Engineering Coordinator, Teaching Assistants' Training Program, UofT www.astro.utoronto.ca/~h-clark <http://www.astro.utoronto.ca/%7Eh-clark> h-clark(a)cita.utoronto.ca Astronomy office phone: +1-416-978-5759

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Variance in phase/profiles
by david collins 11 Apr '20

11 Apr '20

Hi, Everybody! Does anyone out there have a technique for getting the variance out of a profile object? A profile object is good at getting <X> vs. B, I'd then like to get < (X - <X>)^2 > vs B. Matt and I had spittballed the possibility some time ago, but I was wondering if anyone out there had successfully done it. Thanks, d. -- Sent from my computer.

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yt-3.2.1 installation error
by Muhammad Latif 08 Mar '16

08 Mar '16

Hi all, I'm getting the following error while installing yt-3.2.1 latest release. Any idea what is going on here? thanks in advance, cheers Latif Installing nose-1.3.6 Installing python-hglib-1.6 Installing sympy-0.7.6 Doing yt update, wiping local changes and updating to branch stable install_script.sh: line 1025: cd: /home/latif/YT/yt-x86_64/src/yt-hg/: No such file or directory Installing yt ******************************************** FAILURE REPORT: ******************************************** running install_data copying doc/man/isympy.1 -> /home/latif/YT/yt-x86_64/share/man/man1 running install_egg_info Writing /home/latif/YT/yt-x86_64/lib/python2.7/site-packages/sympy-0.7.6-py2.7.egg-info Collecting jinja2 Using cached Jinja2-2.8-py2.py3-none-any.whl Collecting MarkupSafe (from jinja2) Installing collected packages: MarkupSafe, jinja2 Successfully installed MarkupSafe-0.23 jinja2-2.8 /home/latif/YT/yt-x86_64/bin/python2.7: can't open file 'setup.py': [Errno 2] No such file or directory ******************************************** ******************************************** Failure. Check /home/latif/YT/yt-x86_64/yt_install.log. The last 10 lines are above.

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EnzoDatasetInMemory not working in parallel
by Britton Smith 24 Feb '16

24 Feb '16

Hi all, I've recently been trying to use yt's inline analysis functionality with Enzo and am having some difficultly getting it to work in parallel. I am using the development tip of yt. In serial, everything works fine, but in parallel, I get the following error: http://paste.yt-project.org/show/5694/ It seems that the issue is that yt is not correctly identifying which grids are available on a given processory for the EnzoDatasetInMemory object. Does anyone have an idea of how to fix this? Has anyone else seen this? For reference, my user_script is just this: import yt from yt.frontends.enzo.api import EnzoDatasetInMemory def main(): ds = EnzoDatasetInMemory() ad = ds.all_data() print ad.quantities.total_quantity("cell_mass") Thanks for any help, Britton

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Problem with smoothed covering grid
by Max Grönke 06 Nov '15

06 Nov '15

Hi everybody! I followed loosely the example provided here http://yt-project.org/docs/dev/examining/low_level_inspection.html#examinin… but encountered an error message using a smoothed covering grid with SPH data instead of a covering grid. I posted an MWE here: http://pastebin.com/2sStpLmw which leads to the error message "AttributeError: 'YTSmoothedCoveringGrid' object has no attribute '_pdata_source' " I wanted to use a smoothed covering grid because I found that using SPH data a lot of "holes" are in `covering grid' (but not, e.g., in a slice plot). So I assumed there is some problem in duplicating the values from the coarser grids? My yt version is 3.2-dev. Thanks a lot for your time & help, Max

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custom opacity transfer function in volume rendering
by Wolfgang Kastaun 30 Oct '15

30 Oct '15

Hi again, Is there a way to specify the opacity transfer function and the colormap for volume rendering independently? I am looking for something like cam.transfer_function.map_to_colormap(), but allowing me to specify a transfer function for the opacity myself, independently of the transfer function for the colormap. What I am trying to achieve with that is the following: a field below a dynamically chosen cutoff should be completely transparent, so that I can always see the structure of the field where it is strongest, no matter what the absolute strength is. The color on the other hand should depend on the absolute value. E.g. I want to make a movie where I see the structure of the strongest parts of a field, unobstructed by the rest, but with a color that changes together with the absolute field strength. Cheers, Wolfgang.

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Consistent brightness in volume rendering movies
by Wolfgang Kastaun 30 Oct '15

30 Oct '15

Hi, I am trying to assemble Yt volume renderings into a movie using moviepy, which essentially takes a numpy rgb array for each frame and produces a video. However, I am a bit confused on the absolute luminosity in volume renderings. It seems that adding annotations via cam.draw_domain() does not only draw the domain, but also adjusts the image brightness, which is a bit surprising. I did not notice that when using cam.save_image() for a single frame instead using the image array directly, apparently the former does adjust brightness as well. I want to avoid rescaling based on average or maximum brightness *of a single frame* in a movie, because this is misleading. The brightness of a pixel should only depend on the data along the corresponding ray, not on the other rays as well. Rather, the scale should be constant during the movie. I know it is probably difficult, but is there a way to estimate a reasonable scaling from the expected data range of the whole evolution and the size of the domain? Also which other functions besides cam.draw_domain() do implicitly adjust the brightness? Regards, Wolfgang Kastaun.

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installing yt on mac 10.11
by 藤田あき美* 30 Oct '15

30 Oct '15

Hi, I am not able to install yt.3 (stable version, using install_script.sh) on my new mac 10.11. Could anybody help? I attach yt_install.log. Thank you. Akimi

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writing out covering grid.
by Dave Semeraro 20 Oct '15

20 Oct '15

Hello, I have created a covering grid from a sample Enzo dataset. I would like to write the "density" field to a file. I am doing the following but getting an error. cg = ds.covering_grid(3,[0.,0.,0.],ds.domain_dimensions*2**2) cg.write_out("spoot","Density") Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/work/01197/semeraro/maverick/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 399, in write_out field_data = np.array([self.field_data[field] for field in field_order]) KeyError: 'x' Is it possible to write out the single field to a file from a covering grid? DAve

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